Spinning box



June 13, 1933.

I. MEURLING SPINNING BOX 2 Sheets-Sheet L Filed Dec. 23, 1930 INVENTOR WAR MEURLING ,I g 12:19 ai'arnezys I. MEURLING SPINNING BOX June 13, 1933.

Filed Dec. 23, 1930 2 Sheets-Sheet 2 INVENTOR IVAR MEURLING @1521? aliarneys of pr c -molding thebox.

' The spinning box is made of a plastic mol Patented June 13, 1933 UNITED STA S PATENT orr cg IVAR MEURLING, OI RIDLEY PARK, PENNSYLVANIA, ASSIGNOR TO THE VISCOSE COM PANY, OF MARCUS HOOK, PENNSYLVANIA, ACORIBORATION OF PENNSYLVANIA SPINNING BOX Application flled December 23, 1930. Serial No. 504,397.

The present application is in gart a coning'material such as powdered phenolic .con-

ti'nuation of my application erial No.v densation product in combination with lami- 285,587, filed June 15, 1928. nated sheet material of tubular form. The This invention relates to spinning boxes laminated sheet material may be cloth img: for use in the manufacture of artificial silk pregnated with varnish, such as a varnish and the like. The principal object of my incomposed of phenolic condensation roduct, vention is to provide a spinning box of low though I do notwish to limit myse f to the initial cost which at the same time will have use of cloth nor to the use of the particular suficient strength to stand up under conform of molding material mentioned. w tinn d l tion at high peed. A cr1t1cal point of the spinning box is the Figure 1 is a vertical section through a ]uncture between the side walls and the botheating device, showing the laminated sheet tom of the box. This area is subject to severe material of which the'box is partly comstrain during the high speed revolution of posed, ready for preliminary heating; the box.

Figure 2 is a cross-section of a pair, of In makingthe box accordingto this invencrimping molds showing the laminated sheet tion the tube of impregnated laminated sheet material ready to be premolded; and in material is first heated enough to make it dotted lines showing the laminated sheet masomewhat plastic and molded into the general t i l ft it h b 1d d shape of the finished box in order to insure 20 Figure 3 is a vertical section through the having relnforcing layers extend uniformly final molds, showing the pre-molded lamifrom the sides of the box into the bottom of nated sheet material and the powdered phethe box. To this partially molded sleeve of nolic condensation product therein. laminated material is then added a predetera Figure 4 is a similar view showing the box mlncd charge of a powdered phenolic con- 2 after the upper mold has been depressed and densation product and the two are molded tothe article cured; gether under heat and pressure until they are Figure 5'is an elevation partly in section cured and hardened into the finished spinof a fini h d box; a ning box. The steps of premolding and the Figures 6 and 7 show a modified process final molding and curing may bedone in a succession of molds, as illustrated in Figs. 1 g The spinning box which, in the making to4inclusive, or the several ste smay be done of rayon, is used for the coiling and twist- .m-one mold, as illustratedin igures 6 and 7 ing of the filaments as they come from the of the drawings,and as described below. setting bath, has of recent years been molded The preferred method of roducing the from a powdered phenolic condensation spinning box is illustrated in igures 1 to 5 product, and s uch material has been found lnclllslve. suitable for spinning boxes'which revolve at I a speed under 6000 or 7000*revolutions per What longer than the height 0 the wall 11 of minute. It is desirable. however, that the the finished box. The sleeve 10 preferably spinning boxes be revolved at as high speed consists of aplurality of tubes of Woven fabas possible in order to put as much twist as ric impregnated with a phenolic condensapossible into the thread and at the same tio product. A convenientnumber of such time have a high output. It has been discovtu s is about twenty. ered that the centrifugal force engendered J A similar but comparativelyshort sleeve by high speeds tends to crack the phenolic- 12, whose internal diameter is about equal to condensation product boxes. Accordingto the external diameter of the sleeve 10, may thisinventiona cheap and strong spinning be placed about one end,' the top of the sleeve box is produced which withstands any deto become the rim 13 of the top of the finished sired centrifugal force.

box.

In the preferred process of forming the A lamina-ted sleeve 10 is. rovided some not as desired.

lit)

box, the bottom 14 of the sleeve is first placed in a heated device15 (Fig. 1) where linesinFig. 2.

'(see Fig. 4). force itself into the floor 24 of the box and The partially molded sleeve of laminated sheet material is then removed from the crimping mold and weighed in order to de termine the charge of powdered phenolic condensation product required to complete the box. The partially molded sleeve is then introduced into the final mold 20. (Fig. 3.) The sleeve may be heated to a somewhatplastic condition either before or after being placed in the final mold, where it is pressed with a plunger 30 of the final mold to within a'fraction of an inch of its final position in the mold. The plunger is then raised, and a sleeve 21 vand a predetermined weight of powder 22 of a phenolic condensation product are inserted in the mold (see Fig. 3), to form the hub 23 and part 24 of the floor of the finished box (see Fig. 5).

The plunger is then reinserted and pressure is applied, which forces the powdcred material to fill out any portions of the mold which are not filled by the laminated sleeves The powdered material will portions of the interior faces of the walls 11 of the box, assisting in the production of a smooth surface which is important in spinning the rayon. The powdered material also tends to force itself around both the inside and outside of the sleeve 21 forming a layer on the outside of the hub 23 which can then be grooved or. cut. as desired in finishing the box. without cutting the fabric tubes. I

The final molding operation is continued under pressure and with heat until the box is cured or hardened. It will then be found that the powdered phenolic condensation product and the sleeves of laminated sheet material have adhered together very strongly, providing. a complete and integral unit of tremendous tensile strength. 1

It will be noticed that the box resulting from this process has walls molded to shape which are of integral. layers of material extending completely around the box without a break. These layers, it will be noted, also extend from top to bottom. of the wall portion of the box, around the curve 18 (Fig. 5),

which is the crucial point of maximum strain on the. spinning box, and into the floor, providing integrity over the exterior of the portion of the box which is moving at the great est speed., It will also be noted that the powdered material takes part in forming the gottom and a portion of the interior of the The pre-molding operation assures a highly satisfactory box construction. It insures uniformly flowing laminated material around the curve 18 ofsthe box where the walls 11 join the floor. a

The pre-molding and final molding may be successively carried out in one mold, as

illustrated in Figs. 6 and 7. In the modified process there illustrated, the sleeve of laminated sheet material may conveniently be formed of a lon sleeve 24', of say 12 plies, surrounding a s orter sleeve 25 of about 8 plies. -Or the laminated sheet material may be formed in the same way as sleeves 10 and 12 described in connection with Figs. 1-5 inclusive. In this modified process, sleeves 24, 25 are placed in the final mold and at the same time sleeve 21 is placed in the hub portion of,

the mold. The sleeves are heated to a moderate degree of plasticity either before or after placing them in the mold. Then by bringing down the plunger or upper mold '30 the sleeves can be pre-molded to the desired shape a as shown in Fig. 7 The powdered material 22 is then added in the way described above in connection with Fig. 3, and the final molding proceeds in the same manner as described above in connection with Figs. 1-5 inclusive.

The method described in connection with the first five figures is somewhat to be preferred, both because it ensures uniform reproducibility of the contour of the fabrlc sleeve at-the curvature 18 and also because of required, while simultaneously using cheaper apparatus for preliminary operations.

In a box for spinning rayon, it is important that the surfaces have a high degree of smoothness. The outside of the box should be smooth, because roughness increases the windage and requires more power to drive the box at a given speed. The inside of the box should'be smooth for the same reasons asthe outside, and for the additional reason that a rough surface would tend to harm the filaments of rayon which are being spun within the box. Spinning boxes made wholly of a phenolic condensation product have a satisfactory smoothness of surface, but. as ex- 'plained above, they have not sufficient strength to endure the centrifugal pressure to which they are subject.

Cotton cloth is suggested as one suitable form of laminated sheet material which will give suitable strength to the spinning box.

outer layers well with a varnish of a phenolic .condiensation product. However, it sometimes happens that in the course of use or in the process of cleansing the box, the surface coating of varnish on cotton is worn off and the spinning box becomes roughened.

I have discovered that certain fibers, such as animal fibers and cellulose acetate, when impregnated with a phenolic condensation product are more easily fusible in the phenolic condensation product than are cotton fibres. They tend to fuse into a more homogeneous product than do cotton fibers. This homogeneous productis comparatively similar to an unreinforced fused phenolic condensation product in its smoothness. And it does not tend to become roughened by use and cleaning as does a. phenolic condensa-.- tion product reinforced with cotton cloth. Accordingly I prefer to make the layers of o sheet material nearest the surface of the box of impregnated cloth formed of such relatively fusible fibers.

In Figures 1 to 5 of the drawings, the sleeves 10 and 12 are composed mainly of layers 26of cottony cloth impregnated with a phenolic condensation product varnish, in combination with a few layers 27 of similarly impregnated wool cloth, forming the inner and outer surfaces of the tubes or sleeves.

30 In the finished spinning box (Fig. 5) the wool cloth, which is composed of relatively fusible fibers, forms a smooth layer 28 and is susceptible to a high polish similar to that given to an un-reinforced cured phenolic coni 5 densation product. However, I do not wish to limit the invention to the specific forms of laminated sheet material discussed above.

I claim: 1. A spinning box comprising a phenolic o condensation product in combination with a reinforcement of laminated sheet material, the surface layers of said sheet material com prising Wool fibers. v

2. A spinning box comprising a phenolic condensation product in combination with a fabric sleeve reinforcing the side walls, part of the floor and the juncture between said walls and fioor of the box, said sleeve comprising inner layers of cotton cloth and surface layers of wool cloth.

In testimony whereof I have signed my name to this specification.

IVAR MEURLIN G. 

